Suppose that 25% of patients with myocardial infarction (MI) in 2000 died within 24 hours. This proportion is called the 24-hour case-fatality rate. Of the 15 new MI cases in a 2010 study, 5 died within 24 hours. Write H0 and HA, and conduct the appropriate binomial test (via p-value only) to ascertain whether the 24-hour case fatality rate changed from 2000 to 2010.

1. Write H0 and HA

2. What is the corresponding p-value.